Skip advert
Advertisement

XTOOL iOBD2 on-board diagnostic tool

Clever diagnostics box plugs into your car then sends data to your phone

Overall Auto Express rating

5.0

Speedos and in-car fuel economy readings are notoriously inaccurate, but this clever new kit flashes up real-time performance and efficiency data on your phone.

iOBD2 comprises a small white box and a free smartphone app. The box took minutes to fit, as it simply attaches to your car’s On Board Diagnostic (OBDII) port – under the steering wheel in our Kia and in the glovebox of our Peugeot.

Advertisement - Article continues below

Once you’ve downloaded the app to your Apple or Android smartphone, select iOBD2 from your list of WiFi connections. Enter your car’s details, and you get three ways to view live data: Diagnosis, Performance Test and My Dashboard. Diagnosis offers the most info, so can bring up fault codes and tell you what they mean. It found a problem on our car we thought had been rectified.

Performance Test lets you measure acceleration or braking over a set time or distance, while My Dashboard enables you to personalise the data – everything from revs, speed and efficiencyto coolant temperature. However, the displays could be clearer.

At £114, it’s not cheap. Its rival from Garmin, the ecoRoute HD (our Product of the Year 2011), is £99.99, but is for Android only. iOBD 2 works on Android and Apple devices, and is a worthy investment for its functionality.

Skip advert
Advertisement

New & used car deals

Vauxhall Corsa

Vauxhall Corsa

RRP £19,870Avg. savings £6,416 off RRP*Used from £9,695
Nissan Juke

Nissan Juke

RRP £18,205Avg. savings £5,129 off RRP*Used from £6,390
Toyota Yaris Cross
MG MG4

MG MG4

RRP £27,005Avg. savings £3,637 off RRP*Used from £10,250
* Average savings are calculated daily based on the best dealer prices on Auto Express vs manufacturer RRP
Skip advert
Advertisement

Most Popular

Range Rover Electric and Dacia Spring are EV extremes but I've found the sweet spot
Opinion - EV sweet spot

Range Rover Electric and Dacia Spring are EV extremes but I've found the sweet spot

Mike Rutherford believes he's figured out the trick to getting the best EV bargain
Opinion
20 Sep 2026
Skoda Peaq review
Skoda Peaq 2026 - Ellis Hyde

Skoda Peaq review

The Skoda Peaq is the Czech brand's biggest and most expensive car ever, and is a worthy flagship
In-depth reviews
20 Sep 2026
Paris Motor Show 2026: your guide to all the key cars
Paris Motor Show 2026 header image

Paris Motor Show 2026: your guide to all the key cars

Huge motor show looks set for some suitably big reveals in October
News
21 Sep 2026